Question

A 6m high retaining wall with a surcharge of $5kN/m^2$ at the ground surface shown in the figure



The Rankine active pressure (in kN/m) on the wall after the formation of cracks and their location from base is ?

• A. 76.56 kN/m at 1.92 m from base
• B. 78.84 kN/m at 1.71 m from base
• C. 74.28 kN/m at 1.51 m from base
• D. 72.12 kN/m at 1.10 m from base

Answer 1

The correct option is B 78.84 kN/m at 1.71 m from base

If tension cracks are generated, only positive pressure on the wall will act.
So, Resultant force, $=P_2$
= 78.84 kN/m
Location from base
$z=\frac{1}{3}\times (6-0.87)=1.71m$